validate: remove check on rgw_multisite_endpoint_addr definition
validate: remove check on rgw_multisite_endpoint_addr definition

since `rgw_multisite_endpoint_addr` has a default value to
`{{ ansible_fqdn }}`, it shouldn't be mandatory to set this variable.

Signed-off-by: Guillaume Abrioux <30a9df5a0293a6108675377fa1673f7aa713f915@redhat.com>

ceph/ceph-ansible,ceph/ceph-ansible,fgal/ceph-ansible,fgal/ceph-ansible